Added install repo button

README.md

@@ -10,10 +10,14 @@ This Add-on can be used to control any postgreSQL databases on your network, inc
 
 ## Installation
 
-To install this Hass.io add-on you need to add the Expaso add-on repository
-first:
+[![Open your Home Assistant instance and show the add add-on repository dialog with a specific repository URL pre-filled.](https://my.home-assistant.io/badges/supervisor_add_addon_repository.svg)](https://my.home-assistant.io/redirect/supervisor_add_addon_repository/?repository_url=https%3A%2F%2Fgithub.com%2Fexpaso%2Fhassos-addons)
 
-You can do this by navigating to the "Add-on Store" tab in the Supervisor panel and then entering https://github.com/Expaso/hassos-addons in the "Add new repository by URL" field.
+Or in the Home-Assistant add-on store, a possibility to add a repository is provided.
+Use the following URL to add this repository:
+
+```txt
+https://github.com/expaso/hassos-addons
+```
 
 Now scroll down and select the "pgAdmin" add-on.
 Press install to download the add-on and unpack it on your machine. This can take some time.